CMake/Help/guide/tutorial/Step3/MathFunctions/CMakeLists.txt

add_library(MathFunctions MathFunctions.cxx)

# TODO 1: State that anybody linking to MathFunctions needs to include the
# current source directory, while MathFunctions itself doesn't.
# Hint: Use target_include_directories with the INTERFACE keyword

# should we use our own math functions
option(USE_MYMATH "Use tutorial provided math implementation" ON)
if (USE_MYMATH)
  target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")

  # library that just does sqrt
  add_library(SqrtLibrary STATIC
              mysqrt.cxx
              )

  target_link_libraries(MathFunctions PUBLIC SqrtLibrary)
endif()